. >>> mexican president-elect enrique pena nieto took office today talking about the challenges that face his nation. >> we are a nation that is going at two different speeds one that is progress and development, but there is another mexico, that lives in the abandonment and poverty. >> president nieto says the inauguration marked the return of the institutional revolutionary party after 12 years out of presidential mansion. at least four demonstrators and four police officers were injured. 65 people were arrested. those opposed to mr. nieto says he used handout and giveaways to sway voters. . >>> authorities say a linebacker for the kansas city chiefs killed his girlfriend and turned the gun on himself in front of his coach and manager. police arrived at practice facility when he saw jovan belcher with a gun to his head. >> he heard that they had been arguing in the past as far as recently they had been arguing before this morning. >> belcher and his girlfriend leave behind a 3-month-old daughter. the baby is being cared for by relatives. >>> in casper, wyoming police say a computer